H04L67/10—Network-specific arrangements or communication protocols supporting networked applications in which an application is distributed across nodes in the network

H04L67/1095—Network-specific arrangements or communication protocols supporting networked applications in which an application is distributed across nodes in the network for supporting replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes or user terminals or syncML

Abstract

A relay server stores registered terminal information, information on the relay servers that form a relay group by permitting connection among each other, resource, terminals sharing the resource, and information on a message to be transmitted in association with the resource. When an operation instruction regarding the resource held by another terminal is received from the registered terminal to which the relay server is connected, the relay server relays the operation instruction to another relay server. When the message is transmitted to the other terminal by the terminal, message information thereof is relayed.